[thecatspajamas]

Generally speaking and based on my experience, in order of most valuable to least, it would go:

1) original print produced in the period the photo was shot
2) original glass plate negative
3) later period (but still old) print from original negative
4) later period (but still old) print from copy negative
5) modern print from original negative
6) modern print from copy negative

You might think 1 and 2 would be reversed, since the original glass plate negative would necessarily be 1-of-a-kind, but negatives are also practically impossible to display, and you will usually find that collectors gravitate towards something they can actually view and show off.

As for exact value, I'll leave that up to others to comment on, but you will find that a photo of an identified player will have greatly enhanced value over an anonymous one. Even figuring out what team the player is from will help the value. Generally speaking, collectors will not pay top dollar for something that will be a research project. Do the work for them, and then they will get their checkbooks out.